Question

Fan + Medal

Answer 1

Suppose you have data that shows that 12% of athletes test positive for steroids. You also know that 11% of athletes test positive for steroids and actually use steroids. What is the probability that an athlete uses steroids, given that he tests positive?

Answer 2

0.37



0.43



0.51



0.67



0.92

Answer 3

0.67 I think

Answer 4

Can you explain why you think that?

Answer 5

um... Im not quite sure if it is right so I dont want to mess you up

Answer 6

Oh, can someone else help me out?

Answer 7

let me try to redo it

Answer 8

I personally thought it was 0.37

Answer 9

why?

Answer 10

.this is conditional probability
P(A|B)=P(AandB)P(B)

A is prob he uses steroids
B is prob he tests positive
A and B is prob he both uses and tests positive

Answer 11

Because I thought it was 0.25 and 0.37 was the closest

Answer 12

I think your right

Answer 13

yea, your right

Answer 14

I agree with @I_Need_Help_With_Home